QCheckBox {
    spacing: 8px;
}
QCheckBox::indicator {
    width: 16px;
    height: 16px;
    border: 2px solid #999999;
    border-radius: 3px;
    background-color: white;
}
QCheckBox::indicator:checked {
    border-color: #0078d4;
    background-color: #0078d4;
    image: url(:/icons/checkmark.svg);
}
QCheckBox::indicator:indeterminate {
    background-color: #0078d4;
    image: url(:/icons/minus.svg);
}